问题 问答题 简答题

怎样预防仔猪黄痢和白痢?

答案

参考答案:

仔猪黄痢也称速发型大肠杆菌病,一般在生后7日龄内发病,最快有在出生后12小时发病者。仔猪白痢也称迟发型大肠杆菌,一般在10—21日龄发病。此两种病其病原同为致病性大肠杆菌,常出现较高的死亡率(仔猪黄痢)和容易形成僵猪(仔猪黄痢和白痢)。

预防措施:

(1)环境消毒与母体消毒相结合

母猪进产房前用0.1%的特灭杀或0.1%的新洁尔灭或0.1%的高锰酸钾进行全面清洗和消毒,会阴部和 * * 是重中之重。分娩当天再对 * * 和会阴部进行消毒,消毒前将每个 * * 挤出3—5滴乳汁,用盆接好、弃掉。

(2)妊娠母猪的免疫接种

在产前42天和14天分别给母猪接种大肠杆菌基因工程疫苗,以产生足够的母源抗体移行到母乳中。

(3)母猪饲料加药

在产前七天和产后七天给母猪在饲料里加广谱抗菌药,1000公斤饲料加呼诺玢2公斤。也可以加纽伏罗、呼肠舒、利高霉素、土霉素。

(4)母猪产后注射

母猪产后马上注射一针长效的土霉素制剂(如德利先、得米先)。

或注射一针长效的氟苯尼考制剂(如30%的呼诺玢、正气、泰诺康)。

或注射一针长效的磺胺间甲氧嘧啶。

(5)新生仔猪内服药物

仔猪黄痢严重时,出生后立即灌服呼诺玢口服液、或硫酸新霉素、或丁胺卡那霉素,每天两次,连用三天。

仔猪白痢严重时,在生后10日龄按上述方法处理。

(6)提高环境温度

无论冬夏都要设置保温箱,用红外线灯泡照射取暖。可准备250瓦、150瓦、100瓦三种型号,以备不同阶段使用。新生仔猪需要32—33度的高温,以后每周降2—3度。

阅读理解

阅读理解。

     I felt very sad because I was not able to get the ticket to the film Hero last Friday. I learned from the

newspaper that tickets could be bought at the cinema box office in Richland Hills any day between 10:00 a.m.

and 4:00 p. m. Since I work from 9:00 a. m. to 5:30 p. m., the only time I could go to the cinema was during

my 45 minutes' lunchtime. It is a pity that the cinema is on the other side of the town and the bus service

between my company and Richland Hills is not very good. But if you are lucky, you can make the round trip

in 45 minutes.

     Last Monday, I stood at the bus stop for 15 minutes waiting for a bus. By the time I saw one come round

the corner, there was not enough time left to make the trip, so I had to go back. The same thing happened on

Tuesday, and again on Wednesday. On Thursday my luck changed. I got on a bus right away and arrived at

the cinema in twenty minutes. But when I got there, I found a long line of people at the box office. I heard

one man said he had been waiting in line for over an hour. I found I would not have enough time to wait in line.

I caught the next bus and went back across the town.

     By Friday I understood my only hope was to make the trip by car. It was expensive, but I felt it would be

worth it to see the film. The trip by car only took 10 minutes, but it felt like an hour to me. When I reached

the cinema, I was delighted to see that nobody was waiting in line. But I quickly found out that it was because

they had already sold out all the tickets.

1. It seemed that the writer of the story works as a ____. [ ]

A. worker

B. doctor

C. farmer

D. clerk

2. The writer tried to go to the cinema every day, but really got there ____. [ ]

A. five times

B. three times

C. four times

D. twice

3. We can infer from the underlined sentence that the writer was ____. [ ]

A. worried

B. sorry

C. surprised

D. pleased

4. In the end the writer got ____ ticket(s). [ ]

A. one

B. two

C. three

D. no

5. When the writer reached the cinema, he was delighted because ____. [ ]

A. he understood

B. it was expensive, but he felt it would be worth it to see the film

C. the trip by car only took 10 minutes

D. he saw that nobody was waiting in line

选择题